How to refill my stock of Samum Bombs?
Solution 1:
You replenish bombs the same way you replenish your witcher potions - by meditating. You'll use 1 of your strong alcohols, but it will replenish everything.
A list of strong spirits can be found in this question
Solution 2:
If you meditate it will you use 1 alcohol and it will refill all your potions and bombs.